George Finch with a handy little tool for Autodesk Maya called Sharing Custom Attributes, used for instancing a shape node to multiple objects quickly and easily.

“The technique is quite simple and utilises an instance of a curves shape node with custom attributes applied at the shape level.
This script simplifies the task as it allows you to select the shape node and propagate it to multiple objects and also to remove the node when not wanted. Sharing the shape node can not be done directly in the interface as it requires flags only available in a mel script.”